Metal fastener



Feb. 11, 1941. E. R. HARRINGTON METAL FASTENER Filed Aug. 30, 1940EDWARD Fr. HARRINGTON.

Patented Feb. 11, 1941 UNITED STATES r 'rE'r OFFICE 2 Claims.

This inventionrelates to a metal fastener.

An object of the invention is the construction of a novel and efficientfastener which will positively hold two elements together againstaccidental displacement.

Another object of the invention is the construction of a metal fastenerwhich is adapted to be interposed between two parts or two units,whereby they cannot be turned, one with respect to the other, norseparated by a drawing or a thrusting action.

With the foregoing and other objects in view, the invention comprisescertain novel constructions, combinations, and arrangements of parts aswill be hereinafter fully described, illustrated in the accompanyingdrawing, and more particularly pointed out in the appended claims.

In the drawing:

Figure 1 is a view in side elevation of a metal fastener constructed inaccordance with the present invention.

Figure 2 is a rear end view of the metal fastener.

Figure 3 is a top plan view.

Figure 4 is a bottom plan View.

Figure 5 is a view of two units, fastened securely together by myfastening device, and showing the metal fastener in longitudinal centralsection.

Figure 6 is a transverse section view taken on line 6-6 Fig. 5, andlooking in the direction of the arrows. I

Referring to the drawing, in which I have shown the preferred embodimentof my invention, I designates an elongated plate-like body that isprovided with a central concaved portion 2 in its bottom and with a flatbase-edge or rim 3. The concaved portion 2 is open at end 4. The body Iis provided with an upper or outer face, with twolongitudinally-extending grooves 5. Each groove 5 is provided with avertically-extending wall 6 that constitutes a cutting edge, for thepurpose hereinafter described. A row of rearwardly-extending centralteeth to is formed upon the body and by reason of the grooves 5 eachtooth 6a is provided at its ends with outwardlyextending spur-like ends'I. These teeth 6a and ends I efficiently engage or enter portions ofthe primary unit 8 for preventing withdrawing of the auxiliary unit 9when the parts are assembled. The vertically-extending walls 6 ofgrooves 5 enter the primary unit 8 (Fig. 6) whereby the auxiliary unit 9cannot be rotated when the parts are assembled. The primary unit 8 maybe an ordinary chair leg, and the auxiliary unit 9 may be an ordinarychair spoke or rung.

The body I is provided between its side edges and the grooves 5 withauxiliary, small teeth 6b that also penetrate the primary unit 8 whenthe parts are assembled.

To place my metal fastener in position, a groove or cut-out portion I0is formed on the auxiliary unit (Fig. 5) and the plate-like body I islaid in this groove prior to the auxiliary unit being forced into thesocket II of the primary unit 8. When the parts are assembled, as inFigure 5, the fastening device securely retains said parts in anassembled position. Therefore, it will be seen that the auxiliary unit 9cannot have a rotary movement during its assembled position, nor canauxiliary unit be withdrawn when once assembled with the primary unit.

While I have shown in the accompanying drawing the metal fasteningassembled in a wooden structure, still it is equally as useful in artsother than a chair, or the like. For instance, it can be used to fastentogether metal elements, as well as wood elements.

The construction of the body with the concave portion 2 is for a doublepurpose, to wit: (1) The material used in forming the body is preferablyof such nature as will create a tension or slight springy action wherebythe teeth maintain the constant pressure against the engaged portions ofthe socket I I, resulting in a very efficient grip, and allowing noslip, or working loose of the assembled parts. (2) It creates anindentation upon the wood, and does not compress the wood, as a solid'body would do, whereby the portion of the auxiliary unit entering theconcave portion 2 will assist in holding the fastening device in placeas well as all of the parts together. In other words, that part of theauxiliary unit 9 that enters the concave portion 2 acts something like atooth engaging the metal fastener.

It is to be understood that the size of the fastener can be changed, andthat diiferent materials may be used in constructing the fastener,insofar as I do not depart from the spirit of the invention.

While I have described the preferred embodiment of my invention andillustrated the same in the accompanying drawing, certain changes oralterations may appearto one skilled in the art to which this inventionrelates, during the extensive manufacture of the same, and I, therefore,reserve the right to make such changes or alterations as shall fairlyfall within the scope of the appended claims.

What I claim is:

1. A metal fastener comprising a body provided in its upper face withlongitudinally-extending grooves, each groove provided with a verticalside wall constituting a cutting edge, said body provided with centralteeth, and said central teeth provided at their ends with spursoverhanging said grooves.

2. A metal fastener comprising an elongated plate-like body having aconcave underface and with a fiat base-edge or rim, said concaveunderface open at one end, said body provided on its upper and outerface with longitudinally-extend- EDWARD R. HARRINGTON.

